In turbomachinery gas seals are used to impede the leakage flow of the working fluid from high-pressure regions to low-pressure regions. Without increasing rubbing phenomenon floating ring seal allows to minimize the clearance between the inner seal radius and rotor. It is one of non-contact seals. Floating ring seal is not attached to the stator as the others seals are. And its lock-up position is influenced by the operating condition. Childs [1] analyzed and conducted tests for the damper seal and searched the optimal configuration. Ertas [2] compared rotordynamic force coefficients for three types of non-contact annular gas seals. The experimental findings from the study support general approach of replacing traditional labyrinth seals with either "pocket" style or textured damper seals to improve rotordynamic stability of process gas centrifugal compressors. Testing method used to determine direct and cross-coupled force coefficients is frequency dependence method. The main objective of this work is experimentally investigate the effect of clearance ratio, pressure ratio, rotor speed, and excitation frequency on rotordynamic force coefficients on the flexibe floating ring seals at the inlet pressures up to 1 MPa and rotor speeds to 10 krpm.
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